About a month ago I bought a DT250, and unfortunately my DIY AMP didn't pull them up, because I can't remake it, i think about ready-made solutions ( near 250$).
1) Audio-gd NFB 15.32
2) Audio-gd NFB 12.1
3) Maverick Audio D1 Plus
4) O2 + ODAC
5) Fiio E9K + E17.
And then there was a question of choice, because I only have to listen to "Fiio E9K + E17",I ask your opinion.
As a source, I use a laptop ( with IDT HD Audiocard on-board).